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CREATE TABLE pc ( c INTEGER NOT NULL ) STRICT;
✓
CREATE INDEX ipc ON pc ( c DESC );
✓
INSERT INTO pc(c) VALUES (8), (6), (4), (2), (0);
✓
SELECT * FROM pc
c
8
6
4
2
0
WITH RECURSIVE enumerated ( id, c ) AS ( SELECT ROW_NUMBER() OVER (ORDER BY c DESC) id, c FROM pc ), meet_in_middle ( c_id, c_val, iterated_calc ) AS ( -- Anchor dataset with a dummy row, in case `pc` is empty, -- and the first iterative calculation value VALUES (0, 0, 0) UNION ALL SELECT -- next row of `pc` next.*, -- next calculated value prev.iterated_calc + 1 FROM meet_in_middle AS prev INNER JOIN enumerated AS next ON next.id = prev.c_id + 1 -- The id of the next `pc` row -- Similarity to iteratively calculated value is coincidental WHERE prev.iterated_calc <= next.c -- Only iterate if the previous iterated calculation -- does NOT satisfy our condition ) SELECT iterated_calc FROM meet_in_middle ORDER BY c_id DESC LIMIT 1 -- Get only the last row from the CTE ;
iterated_calc
3